These charts show movie character interactions. The horizontal axis is time. The vertical groupings of the lines indicates which characters are together at a given time. On the LoTRs up and down roughly correspond to northwest and southeast.

[Editor's note: Helpful hints on how to go metric if you never had a science class in the US since the 1970s. I don't yet dream in metric but I ain't afraid of it Thanks Jo!]

Republished from XKCD: A webcomic of romance, sarcasm, math, and language.

The key to converting to metric is establishing new reference points. When you hear “26° C,” instead of thinking “that’s 79° F” you should think, “That’s warmer than a house but cool for swimming.” Here are some helpful tables of reference points: